3 years ago

Which feature does the model show accurately

Chemistry

1 answer:

Illusion [34]3 years ago

3 0

We need a image to answer this sorry

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Which of the following lists of elements are in the same PERIOD? *

yuradex [85]

Ca, V, Cu, Kr
Remember a period is a the horizontal rows in the Periodic Table.

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3 years ago

Answers only please 100pts and brainliest. you will be reported for wrong answers.

Ierofanga [76]

Answer:

K= 25.16%

Mn= 34.59%

O= 40.25%

Explanation:

$KMnO_4$

Find the total mass of the compound. You can do this by multiplying by the molar mass.

$K=40*1=40\\Mn=55*1=55\\O=16*4=64$

add them:

40+55+64=159g

Now convert each element individually to grams using molar mass

$1molK(\frac{40gK}{1molK} )=40gK$

$1molMn(\frac{55gMn}{1molMn} )=55gMn$

$4molO(\frac{16gO}{1molO})=64gO$

Divide by the mass of the compound and multiply by 100

$K=\frac{40g}{159g} *100=25.16$

$Mn=\frac{55g}{159g}*100=34.59$

$O=\frac{64g}{159g}*100=40.25$

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3 years ago

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The table below lists norm al and abnormal events. Explain why some events would never happen normally.

vlada-n [284]

Beacause of lack of force in all three scenarios.
In scenario one there’s two forces acting in the bottle atmospheric pressure and gravity.Gravity keeps the ball at the lowest pointwithout force resisting it.
Umber two there’s no other force greater than gravity that would cause movement to the apple..
And number three there are isn’t any force acting in the rubber band greater than the elastic force to make it stretch
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